Geometric measure of quantum discord and the geometry of a class of two-qubit states

Details Geometric measure of quantum discord and the geometry of a class of two-qubit states Geometric measure of quantum discord and the geometry of a class of two-qubit states

2011-12-19

arxiv.org/abs/1112.4318v2

Physics

Quantum Physics

10 pages, 4 figures, comments are welcome

Scientific paper

We investigate the geometric picture of the level surface of quantum entanglement and geometric measure of quantum discord(GMQD) of a class of X states, respectively. This pictorial approach provides us a direct understanding of the structure of entanglement and GMQD. The dynamic evolution of GMQD under two typical kinds of quantum decoherence channels is also investigated. It is shown that there exist a class of initial states for which the GMQD is not destroyed by decoherence in a finite time interval. Furthermore, we establish a factorization law between the initial and final GMQD which allows us to infer the evolution of discord under the influences of the environment.

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